Granted Patent
Utility
US 5,881,355 · App. 08/120,373
Fabrication method of cathode member and electronic tube equipped therewith
Inventors:
Toshikazu Sugimura, Maki Narita, Taro Hirai, Shoichi Hata
Patented Case
View Patent ↗
Granted: Mar 9, 1999
Filed: Jul 22, 1998
Inventors
Toshikazu Sugimura
Maki Narita
Taro Hirai
Shoichi Hata
Assignee (at issue)
NEC CORPORATION
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.